Long-stroke pump-operating mechanism



March 19, 1929. LEONARD 7 1,705,930

LONG STROKE PUMP OPERATING MECHANISM Filed Dec. 19, 1927 2 Sheets-Sheet l 1 l I I l 1 INVENTOR.

fi'ojl Elev/70rd,

V ATTORNEY.

I 1 II 5 I J March 19, 1929. E. LEONARD LONG STROKE PUMP OPERATING mmmmrsu Filed D60. 19, 1927 2 Sheets-Sheet I N VEN TORY Roy E Leo/20rd ATTORNEY.

Patented Mar. 19, 1929. I

ilhli'lliD STATES 1,705,930 PATENT QFFECE.

nor n. rlnonann, or Los ANGELES, CALIFORNIA, ssrenon or one-nets 'ro DAVID a nonnnrnn, or names, TEXAS.

LONG-STROKE PUMP-OPERATING MECHANISM.

Application filed December 19, 1927. Serial No. 241,097.

This invention isan operating mechanism for deep well pumps, and has for its object insure reciprocation of the operating mech .anisui without deviation from the straight line of its longitudinal axis, and to apply power 'to the operating mechanism at diametrically opposite points so as to maintain a balanced driving connection. it is a still further object of the invention to provide an extremely simple and durable construction which is positive in its operation, and which provides for automatic lubrication of its moving parts, and is readily mounted on a derrick floor and operatively connected to the usual polished rod of the pump mechanism of a Well.

Further objects of the readily understood from the following description of the accompanying drawings, in which; i

Fig. 1 is a front elevation of the invention with the front plate of its housing partly broken away.

Fig, 2 is a similar side view of the invention. 1 I

Fig. 3 is a transverse section on the line 8-3 of 1. i

Fig. 4 is a diagrammatic illustration ofthe reversal of the stroke of theop'erating mechanism.

The invention 1s usual polished rod B projects, and the operating mechanism engages the polished rod so as to provide a long stroke reciprocationfor I again meshes with-the other side of lts pinion operating the pump in usual manner.

The housing for the operating mechanism comprises a curved dome 1 extended to form depending front and rear walls 2, which at their lower ends provide a forked construction 3 forming'transversely spaced vertical pockets having inner side walls 4:. The upper ends of the side walls 4 are connected by a base 5, and the lower ends of the pockets are closed by curved extensions 6 of the invention will be adapted for mounting on the derrick floor A of a well so as to straddle,

forked ends of the walls 2, with these extensions providing a supporting base 7 having corner lugs 8 forbolting the housing to the derrick floor. The sides of the housing are closedfby the plates 9. i v

Bearings 10 project from the side plates 9 medially of their width and height, and shafts 11 are journaled in these bearings and are adapted for rotation in'opposite directions with pinions 12 fixed on their inner ends and projecting intothe housing at opposite sides thereof A cross head 13 is pivoted at its respective ends to vertical rack bars 14 which are thus adapted for dependent. ver-- tical reciprocation in the housing adjacent the respective side plates 9, and the rack bars are provided with continuous racks 15 extending along their front and rear vertical edges and around their curved ends, with the racks of the respective bars adapted to mesh with the respective pinions 12, at either side thereof. a

With the parts in the position shown in Fig. 3, the rack bars are adjacent the front and rear walls respectively of the housing so that the rack bars mesh with opposite sides of their respective oppositely rotating pinions and are thereby both reciprocated downwardly, and at theend of'the stroke of the rack bars the curved ends of the racks" remain in mesh with their pinions and therack bars are thereby moved around their pinions and thus oppositely shifted as permitted by the turning of cross head 13 so that the racks are then adjacent the rear and front walls respectively of the housing as shown in dotted lines in Fig. 3, with the other vertical edge of each rack in mesh with the other side of its pinion for reversing the stroke of the rack bars by the continuous turning of the pinions invthe same respectively opposite direction. At the upper end of their stroke the rack bars are similarly oppositely shifted so as to resume the position shown in full lines in Fig. 3 so that the other vertical edge of each rack bar the downward stroke of the rack fling laterally beyond each ofthe rack bars e the tracks during movement of the rack bars around their pinions as shown in T1. 4i and that srnnlarly at the upper end rel c of the rack bars while the upper rollers l9 Wlll remain in engagement with tracks 18, the lower rollers 19 will disengage +1 LA in the tracks as shown in dotted lines in Fig. 4:. l ms are preferably provided. for guiding these ends of the rack bars at which the rollers 19 do not a min in engagement with tracks 18 during Slllllllllg of the racks, and for this purpose guide rollers 21 on the rack bars may engage guide tracks 22 so as to maintain the racks in nieshi g engagement with. their pinions during slitting movement of the rack bars around their pinions as shown in Fig. 4

The guide rollers 21 project from the rack bars adj acent their respective ends but in such position as to clear the tracks 18 as shown in Figs?) and l and. the tracks 22 are mounted. on the side plates 9 above and below the pinions 12,, and are so curved that the rollers 21 by engaging these tracks will maintain the racks 15 in mesh with their pinions. The tracks 22 are of restricted. length and so positioned that the rollers 19 will clear the same, and the rollers 21 are so positioned as to aii'ord the earliest possible engagement with the tracks 22 as the ends of the rack bars move around their pinions. For this purpose the rollers 21 at the respective ends of each rack bar are in close proximity to the respective vertical toothed edges of the rack bar as shown in 2 and as a consequence the roller 21 at the lower end of the rack bar will clear the track 22 which below pinion 12 while the roller 21 at the upper end oi the rack will engage this track during completion of th downward stroke of the mechanism as shown in Fig. 4, and, the roller 21 at the upper end of the rack will. clear, and the roller 21 at the lower end of i rack will engage, the track 22 which above die pinion 12 during completion of the upward stroke of the mechanism as shown in dotted lines l lteciprocation of the rack bars thus scribed is adapted to reciprocate the pol Ix: rod which e2" ends vertically through t 10 l' ous-aing when latter stradd es the cashQad. pour red rod extends through I H L l A the V i .c, i 1 cross head 13 which is rice to tinn on inc rod, and the polished rod is fixed to the cross head for reciprocation therewith by means of usual clamps 30.

The pivotal connections between the rack bars and the cross head preierablycomprise slotted lugs 31 projecting from the rack bars and adapted to'receive bearing heads'32 at the ends of thevcross head between the same. Pivot pins 33 extend through the bearing heads and into the slots of lugs 81 thereby permitting swinging of the cross head with relation to the rack bars as the latter are shifted from one side to the other of their pinions, and the slots which receive the pivot pins provide for the necessary play at the pivotal connections in order to prevent binding of the parts, and for a similar purpose the rack bars are preferably recessed in alinement with the bearing heads 32 as shown at 35, in order to clear the outer ends of the bearing heads when the cross head is turned.

The upper end of the polished rod B preferably projects above the housing with a clamp 4:0 fixed thereon and adapted to com- I and thereby moves the rack bars to a position where the pinions 12 engage the vertical portions of the racks 15 for providing a positive driving connection. During the upward stroke the clamp 40 moves clear of the expanded spring 41, and the weight of the mechanism and the string of sucker rods depending therefrom moves the rack bars be yond upper dead center so as to again positively engage the vertical portions of racks 15 by the operating pinions.

The pockets formed between the inner side walls 41- and side plates 9 are closed except at their upper ends and are so positioned as to receive the lower ends of the rack bars at the completion of the downward stroke; and a suitable lubricant is contained in these pockets for the purpose of lubricating the racks 15 and thereby transmitting the lubricant to the cooperating teeth of the pinions 12 for providing an automatically lubricated operating connection.

The driving connection whereby the pinions 12 are oppositely rotated is shown as comprising iacing beiv led gears 50 fixed on shafts 51 and oppositely rotatedloy a co-operating beveled pinion 52 which is fixed on a drive shaft 53. Sprockets 54 may be mounted on the shafts '51, and suitable sprocket chains 55 may cooperate therewith and engage sprockets 56 on the pinion shafts 11 for oppositely rotating the pinions,

By the construction as thus described, I have provided extremely practical means for obtaining a relatively long stroke for a deep well pump, the rack and pinion operating coninitiates the upward stroke of the mechanism nection insuring reciprocation of the polished rod in a straight line and provided for the long stroke reciprocation with a minimum expenditure of energy; The" construction also provides for long stroke reciprocation with relatively slow reversal of the direction of the stroke as a result of the rack loarsmoving their curved ends and adapted to mesh with either side or the respective pinions for reciprocating'the rack bars, and a cross head pivotally connected to the rack bars so as to permit swinging of the cross head-and shiiting of the rack bars from one sideto the other of their respective pinions as the curved portions of the racks move around their cooperating pinions at the respective ends of the stroke of the rack bars. I V

2. A reciprocating driving connection comprising oppositely rotating pinions, rack bars having curved ends withcontinuous racks extending along their side edges and around their curved ends and adapted to mesh with either side of the respective pinions for reciprocating the rack bars, a cross head pivotally connected to the rack bars so as to permit swinging ofthe cross head and shifting of the rack bars from one side to the other of their respective pinions as the curved portions of the racks move around their cooperating pinions at the respective ends of the stroke of the rack bars, and means for-guiding the rack bars during reciprocation thereof so as to maintain the racks in meshing engagement with their pinions.

3. A reciprocating driving connection comprising oppositely rotating pinions, rack bars having curved ends with continuous racks eX- tending along their side edges around their curved ends and adapted to mesh with either side of the respective pinions for ciprocating the rack bars, a cross head pivotally connected to the. rack bars so as to per mit swinging of the cross head and shifting of the rack bars from one side to the other of their respective pinions as the curved portions of the racks move around their cooperating pinions at the respective ends of the stroke of the rack bars, and means for guiding the rack bars during movement of the racks around their cooperating pinions so as to maintain the racks in meshing engagement with their pinions.

a. A reciprocating driving connection comprising housing forming pockets adapted to contain a lubricant, oppositely rotating pinions mounted in the housing, rack bars having curved ends with continuous racks extending along thelr side edges and around thelr curved ends and adapted to mesh with either side of the respective pinionsgtor reciprocating the rack bars, a cross head pivotally connected to therack bars so as to permit swinging of the cross head and shifting of the rack bars from one side to the other of their respective pinions as the curved portionsot the racks move around their cooperat ing pinions at the respective ends of the stroke of the rack bars, and the said reciprocating and shittable rack bars extending into the said pockets durlng said movement of the rack bars.

5. A reciprocating driving connection comprising oppositely rotating pinions, rack bars having'curved ends with continuous racks 8X- tending along their side edges andaround their curved ends and adapted to mesh with either side of the respective pinions for recipro-cating the rack bars, a crosshead pivotally .connected'tothe rack bars so as to permit swinging of the cros'shead and shifting of the rack bars from one side to the other of their respective pinions as the curved portions of the racks move around their cooperating pinions at the respective ends of the stroke of the rack bars, and, a spring adapted for compression bymovement of the rack bars toward the end of their stroke and adapted to move the rack bars beyond dead center as the curved ends of the racks move around their cooperating pinions.

6. A long stroke operating mechanism for a deep J well pump comprising a housing adapted for mounting on a derrick floor so 1 as to straddle the casing head of the well with the polished rod of the pump projecting upwardly through said housing, opposltely rotating pinions mounted in the housing, rack bars having curved ends with continuous racks extending along their side edges and around their curved ends and adapted to mesh with either side of the respective pinions forreciprocating the rack bars, a cross head pivotally connected to the rack bars so as to permit swinging of the cross head and shifting of the rack bars from one side to the other of their respective pinions as the curved portions of racks move around their-cooperating pinions at the respective ends of the stroke of the rack bars,the cross head providing for projection of the said polished rod therethrough at theaxis of its swing, and means for fixing the polished rod to the cross head for] reciprocation therewith.

7. Areciprocatingdriving connection comprising oppositely rotating pinions, rack bars having curved ends with continuous racks extending along their sid'eedges and around theircurved ends and adapted to mesh with either side oi? the respective pinions for reciprocating the rack bars, a cross head pivotally connected to the rack bars so as to permit swinging of the cross head and shifting of the rack bars from one side to the other of their respective pinions as the curved portions of the racks move around their cooperating pinions at the respective ends of the stroke of the rack bars, and means for guiding the rack bars during reciprocation thereof so as to maintain the racks in meshing engagement with their pinions, the said guiding means con'iprising cooperating tracks and anti-frictional contact means.

8. A. reciprocating driving connection comprising oppositely rotating pinions, rack bars having curved ends with continuous racks extending along their side edges and around their curved ends and adapted to mesh With either side of the respective pinions for reciprocating the rack bars a cross head pivotally connected to the rack bars so as to permit swinging ot' the cross head and shifting of the rack bars from one side to the other or their respective pinions as the curved portions of the racks move around their cooperating pinions at the respective ends of the stroke of the rack bars, tracks following the path or" travel of the side edges and curved ends of the rack bars during reciprocation thereoi, and anti-frictional contact means at the ends of the rack bars cooperating with said tracks for maintaining the racks-in meshing en agement with their pinions during reciprocation of the rack bars;

9. A reciprocating driving connection comprising oppositely rotating pinions, rack bars having curved ends with continuous racks extending along their side edges and around their curved ends and adapted to mesh with either side of the respective pinions for reciprocating the rack bars, a cross head pivotally connected to the rack bars so as to permit swinging oi the cross head and shifting of the rack bars from one side to the other of their respective pinions as the curved portions of the racks move around their cooperating pinions at the'respective endsof the stroke of the rack bars, trac is following the path of travel of the ends or the rack bars around the pinions, and anti-frictional contact means at the ends of the rack bars cooperating with said tracks for maintaining the racks in meshing engagement with their pinions during movement of the racks around their cooperating pinions.

testimony whereof he has aifixed his signature to this specification.

ROY E. LEONARD. 

